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Infect. Immun., 04 1997, 1317-1320, Vol 65, No. 4
AM Cooper, C D'Souza, AA Frank and IM Orme
CD8 T cells have been shown to be protective against Mycobacterium
tuberculosis infections in the mouse. These cells have been shown to be
cytolytic toward M. tuberculosis-infected cells and have also been shown to
release the protective cytokine gamma interferon in response to
mycobacterial antigen. It has therefore been unclear how these cells
mediate their protective response. To dissect this problem, we compared the
courses of M. tuberculosis infections in control, perforin gene- knockout,
and granzyme gene-knockout mice exposed by the realistic pulmonary route.
The inability to express either of these molecules limits the expression of
the major lytic pathway but does not appear to influence the course of the
infection or result in any discernible histologic differences. These data
seem to rule against a lytic role for CD8 T cells in the lungs and hence
tend to suggest instead that another type of mechanism, such as cytokine
secretion by these cells, is their primary mode of action.
Copyright © 1997, American Society for Microbiology
The course of Mycobacterium tuberculosis infection in the lungs of mice lacking expression of either perforin- or granzyme-mediated cytolytic mechanisms
Department of Microbiology, Colorado State University, Fort Collins 80523, USA.
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